Some remarks on the Pethő public key cryptosystem
Journées arithmétiques de Genève - 9-13 septembre 1991, Astérisque, no. 209 (1992), pp. 257-264 
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     author = {Lassak, Morislav},
     title = {Some remarks on the {Peth\H{o}} public key cryptosystem},
     booktitle = {Journ\'ees arithm\'etiques de Gen\`eve - 9-13 septembre 1991},
     editor = {Coray D. F. and P\'etermann Y.-F. S},
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     year = {1992},
     publisher = {Soci\'et\'e math\'ematique de France},
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Lassak, Morislav. Some remarks on the Pethő public key cryptosystem, dans Journées arithmétiques de Genève - 9-13 septembre 1991, Astérisque, no. 209 (1992), pp. 257-264. https://www.numdam.org/item/AST_1992__209__257_0/

[1] A. Petho, On a polynomial transformation to the construction of a public key cryptosystem, Proceedings of the Colloquium on Computational Number Theory held at Kossuth Lajos University, Debrecen (Hungary), September 4-9, 1989. | Zbl

[2] K. A. Rodosskij, Euclid algorithm, Moscow, Nauka, 1988 (in Russian). | MR